I don't know if its the image size, I have tried to compressed the image, but it wasn't working...
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iamnardsJun 6 '13 at 3:39

here is my workaround, I upload the image in Google Photos and call the image location, and it works. I don't know what is the problem... but I let it the way it is for now... thank you all! :)
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iamnardsJun 6 '13 at 3:41

The Open Graph meta tags, specifically og:image, might help, depending on how you were wanting it to be displayed. Using the open graph tags, your website will appear as a link with a thumbnail. Clicking on the thumbnail will go to the url, not show the full photo within facebook.